My great-grandfather Mike Jelen moved to southern Illinois around 1909 with wife Bertha, and children Peter, Mike, Louisia, Bertha, and Joe. Shortly after emigrating, they changed their last name to Girup. They came from the Galacia part of Poland, not too far from what is now Bohumin, Czech Republic.
Mike and Bertha apparently divorced in the early 1910's and Bertha married a Louis Drefs, also from Poland. Son Peter (my grandfather) married Florence Smith. Son Mike married Lillian Hicks, Daughter Bertha married Joe Zaroski. Son Joe apparently didn't marry and I haven't found anything on daughter Louisia. Mike Jelen mentions being related to a Peter Krause of Stauton, IL on his WW I draft card.
That's about all I know. I would guess that we probably had some other Jelen relatives here in the midwest. If you think you might be related or have any additional information, please let me know: firstname.lastname@example.org